Building Integrated Timing Source for the Cisco 12000 Series Router

The Cisco 12816 and 12810 routers incorporate a Stratum 3E internal timing reference to provide system timing based on input received from an external Building Integrated Timing Supply (BITS) clock source. A holdover mode maintains timing accuracy in the event that external synchronization references become corrupted or unavailable.

Feature History for Building Integrated Timing Source for the Cisco 12000 Series Router

Release

Modification

12.0(31)S

This feature was introduced for Cisco 12816 and 12810 routers and Cisco 12000 Series Engine-6 Packet-over-SONET line cards.

Finding Support Information for Platforms and Cisco IOS Software Images

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Restrictions for BITS for the Cisco 12000 Series Router

•The primary and secondary BITS sources must be configured on different slots. The primary and secondary BITS sources cannot be from the same PRP-2 or PoS line card.

•Synchronous Status Messaging (SSM) is not supported.

Information About BITS for the Cisco 12000 Series Router

To eliminate SONET timing slips, a router with a BITS clock can synchronize traffic over all SONET interfaces to an external, highly stable Stratum 2 or better reference clock. The router can distribute the BITS clock signal among many network devices within a building to achieve POP-wide synchronization. Line cards that support BITS do not require manual configuration of internal or line timing because timing is automatically synchronized to the BITS signal. Thus, configuration errors are reduced. The Cisco 12000 Series router BITS implementation is compliant with Telecordia GR-1244-CORE and GR-253-CORE specifications.

BITS Clock Reference Input Sources

The Clock Scheduler Cards (CSCs) of the Cisco 12816 and 12810 routers can provide centralized BITS timing to BITS-supported line cards and can receive external BITS reference clock inputs from two independent sources as follows:

•T1 or E1 controller of the Performance Route Processor 2 (PRP-2)

•Ingress interface of a supported Packet-over-SONET line card

The CSC BITS clocks are present on both CSCs to provide 1+1 redundant BITS clock capability. The CSC BITS clock can synchronize to any combination of 8 kHz, 1.544 MHz, 2.048 MHz and 19.44 MHz signals in normal (locked) mode.

Figure 1 shows a portion of a Cisco 12000 PRP-2 front panel. The two BITS ports are for external BITS clock timing inputs. Port BITS 0 is hardwired as a T1 port, Port BITS 1 as an E1 port. Both have RJ-48 connectors.

Figure 1 BITS Ports on the PRP-2

Freerun, Normal, Fast-start, and Holdover Modes

The CSC BITS clock operates in four standard modes, freerun, normal, fast-start, and holdover. The modes relate to the behavior of the CSC BITS clock, as shown in the following table:

CSC BITS Clock Timing Mode

CSC BITS Clock Behavior

Freerun

Distributes a Stratum 3E precision clock signal throughout the router without reference to an external signal.

Normal

Synchronizes with one of the two external BITS clock sources so that the output signal and input signal are the same (locked).

Fast-start

Occurs when switching to an alternative external BITS clock source.

Holdover

Outputs a Stratum 3E precision clock signal conforming to timing data acquired when the CSC BITS clock was last synchronized to an external BITS reference source.

The Cisco term "autoselection" denotes the ability of the CSC BITS clock to switch among these operating modes automatically. Freerun and holdover modes can be manually selected (forced) with the Command Line Interface (CLI).

Primary, Secondary, Revertive and Non-revertive Operation

The preferred external BITS timing source is configured as the "primary," an alternative source as the "secondary." In normal mode, the CSC BITS clock synchronizes (locks) to the primary source by default. If the primary source becomes corrupted or disabled, the CSC BITS clock switches to the secondary external BITS timing source. A CSC BITS clock configured for revertive mode switches back to the primary if the primary source is restored. In non-revertive operation, the CSC BITS clock switches back to a restored primary only if the secondary also fails or becomes unavailable. Non-revertive is the default mode.

Holdover and Freerun Operation

The CSC BITS clock enters holdover mode if both external BITS timing references are lost. Stored timing data allows the CSC BITS clock to maintain the accuracy of the last external BITS timing source to which it was locked during normal operation. The holdover signal is maintained to the precision of the Stratum 3E clock. If the CSC BITS clock stored timing data is compromised or is not available, the CSC BITS clock enters freerun mode. The freerun signal is distributed to all supported line cards.

Manual Timing Mode Switching

The administrator can force the BITS clock to switch between primary and secondary reference signals or force the CSC BITS clock into holdover or freerun mode with the bits-clock privileged EXEC commands.

Note When the timing mode is forced with a privileged EXEC command, the CSC BITS clock does not return to normal operation until manually forced back to autoselection with the clear bits-clock privileged EXEC command.

How to Configure BITS for the Cisco 12000 Series Routers

The command line interface does not allow configuration or show commands for BITS features if the Clock Scheduler Cards do not support BITS. Line cards or route processors without BITS support cannot be configured as primary or secondary BITS clock sources. The PRP-2 can only provide the external BITS timing source to the CSC but the BITS-supported line cards can both synchronize to the CSC BITS clock and provide the external BITS timing source.

To comply with the Telecordia GR-1244 specification, CLI commands are provided to manually force timing modes.

The configuration tasks pertaining to the Building Integrated Timing Source for the Cisco 12000 Series Router feature are contained in the following sections:

(Optional). Displays the configuration and status of the T1 interface.

Note The BITS0 port signifies T1 port and BITS1 signifies E1 port. The main significance and use of T1/E1 port is for sourcing BITS clock to the chassis. Because the T1/E1 ports do not pass any data traffic, you do not need to issue the commands `shutdown' and `no shutdown'. By default, it will be `no shutdown' when T1/E1 settings appear.

Configuring the E1 BITS Port on the PRP-2 to Receive External Timing

SUMMARY STEPS

1. enable

2. configureterminal

3. controller e1 slot/port

4. framing {crc4|no-crc4}

5. linecode {ami|hdb3}

6. end

7. show controller e1

DETAILED STEPS

Command or Action

Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2

configureterminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

controllere1slot/port

Example:

Router(config)# controller e1 9/1

Specifies the slot and port number of the PRP-2 interface to configure. Enters controller configuration mode.

•BITS 0 port is reserved as T1, BITS 1 port as E1.

Step 4

framing {crc4|no-crc4}

Example:

Router(config-controller)# framing crc4

(Optional) Specifies the framing of the of the E1 signal—Cyclic Redundancy Check 4, and no Cyclic Redundancy Check 4. Default is CRC4.

Note The BITS0 port signifies T1 port and BITS1 signifies E1 port. The main significance and use of T1/E1 port is for sourcing BITS clock to the chassis. Because the T1/E1 ports do not pass any data traffic, you do not need to issue the commands `shutdown' and `no shutdown'. By default, it will be `no shutdown' when T1/E1 settings appear.

Configuring Primary and Secondary BITS Clock Sources

The primary and secondary external BITS clock reference sources can be of the following combinations:

•T1 or E1 port of a PRP-2 and a BITS-supported line card interface

•Two BITS-supported line card interfaces (interfaces on separate line cards)

SUMMARY STEPS

1. enable

2. configureterminal

3. bits-clock

4. primarycontrollert1slot/port

5. secondary interface posslot/port

6. end

7. show bits-clock

8. end

9. show controller t1

10. show bits-clock

DETAILED STEPS

Command or Action

Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2

configureterminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

bits-clock

Example:

Router(config)# bits-clock

Enters bits-clock configuration mode.

Step 4

primary controller t1slot/port

Example:

Router(config-bits)# primary controller t1 9/0

Specifies which external BITS clock signal source should be referenced first for normal mode operations. The primary reference can be a T1 or E1 port on the PRP-2 port, or an ingress port of a BITS-supported line card. In this example the primary reference is a T1 port.

Specifies which external BITS clock signal should be referenced for normal mode operations if the primary signal is unavailable or corrupted. The secondary reference can be a T1 or E1 port on the PRP-2 port, or an ingress port of a BITS-supported line card. In this example the secondary reference is a line card port.

•The primary and secondary BITS clock source cannot be from the same slot.

Step 6

end

Example:

Router(config-bits)# end

Exits to privileged EXEC mode.

Step 7

show bits-clock

Example:

Router# show bits-clock

(Optional). Verifies that the primary and secondary sources are configured.

Configuring BITS Timing Modes Globally

All no forms of the BITS timing mode commands restore the default non-revertive mode.

Forcing BITS Timing Modes

Note When the timing mode is forced with a privileged EXEC command, the CSC BITS clock does not return to normal operation until manually forced back to autoselection with the clear bits-clock privileged EXEC command.

SUMMARY STEPS

1. enable

2. bits-clock {freerun | holdover | primary | secondary}

3. end

4. show bits-clock

DETAILED STEPS

Command or Action

Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2

bits-clock {freerun | holdover | primary | secondary}

Example:

Router# bits-clock secondary

(Optional). Manually switches the BITS operating mode and the external BITS timing source. In this example, the external BITS timing source is manually switched to the secondary source.

Step 3

end

Example:

Router(config-bits)# end

Exits to privileged EXEC mode.

Step 4

show bits-clock

Example:

Router# show bits-clock

(Optional). Verifies that the manual changes occurred.

Disabling BITS Support for Line Cards

BITS support can be disabled to BITS-supported line cards, forcing the line card to use its internal clock (as do line cards that do not support BITS).

SUMMARY STEPS

1. enable

2. configureterminal

3. bits-clock

4. disable slot slot

5. end

6. show bits-clock

DETAILED STEPS

Command or Action

Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2

configureterminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

bits-clock

Example:

Router(config)# bits-clock

Enters bits-clock configuration mode.

Step 4

disableslot slot

Example:

Router(config-bits)# disable slot 6/0

(Optional) Disables BITS clocking for specified slots.

•The PRP-2 cannot be disabled.

•To enable BITS support for the slot, use the no form of the command.

Step 5

end

Example:

Router(config-bits)# end

Exits to privileged EXEC mode.

Step 6

show bits-clock

Example:

Router# show bits-clock

(Optional) Displays which slots are disabled in the BITS Clock Configuration fields.

Configuration Examples for Building Integrated Timing Source for the Cisco 12000 Series Router

The following two show commands display the information necessary to monitor and verify the CSC BITS clock operation:

RFCs

RFCs

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Description

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Command Reference

bits-clock

To force the Clock Scheduler Card BITS clock to synchronize to a different external BITS reference signal or to switch the timing mode, use the bits-clock command in privileged EXEC mode.

bits-clock {freerun|holdover|primary|secondary}

Syntax Description

freerun

Sets the CSC BITS clock to freerun mode.

holdover

Sets the CSC BITS lock to holdover mode.

primary

Sets the preferred external clock reference source.

secondary

Sets the alternative external clock reference source.

Command Default

None

Command Modes

Privileged EXEC

Command History

Release

Modification

12.0(31)S

This command was introduced for the Cisco 12816 and 12810 routers, the Cisco 12000 PRP-2 and Engine 6 PoS line cards.

Usage Guidelines

This command overrides the global configuration settings for the Clock Scheduler Card (CSC) BITS clock. To restore the CSC BITS clock to the default non-revertive, autoselection operation, use the clear bits-clock privileged EXEC command. The following table describes the bits-clock command keywords:

BITS Clock Command

Explanation

bits-clockfreerun

Forces the CSC BITS clock into freerun mode. In freerun mode, the CSC BITS clock is not synchronized to either of the two external BITS timing reference inputs. Freerun mode is typically enacted in the following circumstances:

•Default state before network synchronization occurs, immediately following system power-up

•When a Stratum 3E master clock source is required in the absence of a BITS clock source. For example, in point-to-point asynchronous mappings.

•When timing history in holdover mode becomes corrupted or unavailable.

bits-clockholdover

Forces the CSC BITS clock into holdover mode.

In holdover mode, the CSC BITS clock uses data from a history buffer to control its output frequency. The history data is acquired while the CSC BITS clock is locked to an external BITS timing signal. If the CSC BITS clock history buffer is compromised or contains no data, the CSC BITS clock enters freerun mode.

bits-clock primary

Selects the preferred external timing reference to which the CSC BITS clock synchronizes.

bits-clock secondary

Selects the alternative external BITS timing reference to which the CSC BITS clock signal synchronizes when the primary reference is disabled or corrupted.

Note The privileged EXEC bits-clock commands are not saved in the running-config or startup-config files as are the global configuration bits-clock mode commands.

Examples

The following example switches the BITS clock from the primary source to the secondary source:

Router# bits-clock secondary

The following example forces the BITS clock into holdover mode:

Router# bits-clock holdover

Related Commands

Command

Description

bits-clock disable

Disables BITS clock timing for specific line card slots.

bits-clock mode

Configures the Clock Scheduler Card BITS clocking modes.

bits-clock primary

Configures a line card interface or a PRP-2 T1/E1 controller to be a primary BITS clock source.

bits-clock secondary

Configures a line card interface or a PRP-2 T1/E1 controller to be a secondary BITS clock source.

clear bits-clock

Resets Clock Scheduler Card BITS clock defaults.

show bits-clock

Displays the status of the current BITS configuration.

show monitor event-trace bits-clock

Displays a log of Clock Scheduler Card BITS clock events.

bits-clock disable

To disable BITS clock timing to specific line card slots, use the bits-clockdisable command in bits-clock configuration mode. To enable BITS clock timing to specific line card slots, use the no form of this command.

bits-clock {disable slot slot}

no bits-clock {disable slot slot}

Syntax Description

disable

Specifies that the BITS clock signal is to be disabled.

slot

Indicates a line card slot.

slot

Specifies the slot number of the line card to disable.

Command Default

None

Command Modes

Bits-clock configuration

Command History

Release

Modification

12.0(31)S

This command was introduced for the Cisco 12816 and 12810 routers, the Cisco 12000 PRP-2 and Engine 6 PoS line cards.

Usage Guidelines

Use this command with BITS-supported line cards that are not intended to synchronize with the Clock Scheduler Card (CSC) BITS clock. A BITS-supported line card automatically synchronizes to the CSC BITS clock signal when the signal is present. The bits-clock disable command causes the BITS-supported line card to use its onboard clock.

Examples

The following example disables BITS clock support to slot 6:

router# configure terminal

router(config)# bits-clock

router(config-bits)# disable slot 6

router(config-bits)# end

Related Commands

Command

Description

bits-clock

Forces the Clock Scheduler Card BITS clock to synchronize to a different external BITS reference signal or switches the clocking mode.

bits-clock mode

Configures the Clock Scheduler Card BITS clocking modes.

bits-clock primary

Configures a line card interface or a PRP-2 T1/E1 controller to be a primary BITS clock source.

bits-clock secondary

Configures a line card interface or a PRP-2 T1/E1 controller to be a secondary BITS clock source.

clear bits-clock

Resets Clock Scheduler Card BITS clock defaults.

show bits-clock

Displays the status of the current BITS configuration.

show monitor event-trace bits-clock

Displays a log of Clock Scheduler Card BITS clock events.

bits-clock mode

To configure the Clock Scheduler Card BITS clock timing mode, use the bits-clock mode command in global configuration mode. To restore the default timing mode, use the no form of this command.

bits-clockmode {freerun | holdover | non-revertive | revertive}

no bits-clockmode {freerun | holdover | non-revertive | revertive}

Syntax Description

mode

Configures the BITS timing modes.

freerun

Specifies freerun clocking mode.

holdover

Specifies holdover clocking mode.

non-revertive

Default. Specifies non-revertive clocking mode.

revertive

Specifies revertive clocking mode.

Command Default

normal, non-revertive

Command Modes

Bits-clock configuration

Command History

Release

Modification

12.0(31)S

This command was introduced for the Cisco 12816 and 12810 routers, the Cisco 12000 PRP-2 and Engine 6 PoS line cards.

Usage Guidelines

Upon power-up, the default timing modes are normal and non-revertive. In normal mode, the CSC BITS clock synchronizes to a configured primary or secondary external BITS clock signal and enters into freerun mode if an external signal is not found. If a signal is found and synchronization occurs for a sufficient duration, the CSC BITS clock enters holdover mode until an external clock source becomes available, or until the CSC BITS clock is manually switched to another mode. To restore the CSC BITS clock to the default non-revertive, normal mode, use the clear bits-clock privileged EXEC command. The no form of the mode command, regardless of the keyword, restores the mode to non-revertive. The following table describes the bits-clock mode keywords:

BITS Clock Mode Command

Explanation

freerun

Specifies freerun mode. In freerun mode, the CSC BITS clock is not synchronized to either of the two external BITS timing reference inputs. Freerun mode is typically used in the following circumstances:

•Default state before network synchronization occurs, immediately following system power-up

•When a Stratum 3E master clock source is required in the absence of a BITS clock source. For example in point-to-point asynchronous mappings.

•There is no valid timing history for the holdover mode

holdover

Specifies holdover mode.

In holdover mode, the CSC BITS clock uses data from a history buffer to control its output frequency. The history data is acquired while the CSC BITS clock is locked to an external BITS reference signal. If the CSC BITS clock history buffer is compromised or contains no data, the CSC BITS clock enters freerun mode.

revertive

Specifies revertive mode.

If the primary external BITS clock source degrades or is unavailable, the CSC BITS clock switches over to the secondary external BITS clock source. If the primary source is restored, the CSC BITS clock switches back automatically to the primary.

non-revertive

(Default) Specifies non-revertive mode. If the primary external BITS clock source degrades or is unavailable, the CSC BITS clock switches over to the secondary external clock source, and remains synchronized with the secondary even if the primary is restored. An automatic switch back to the primary occurs only if the primary is restored and the secondary fails. If both primary and secondary fail, the CSC BITS clock enters holdover mode. If holdover mode is not possible, the CSC BITS clock enters freerun mode.

Examples

The following example configures the BITS clock revertive mode:

router(config)# bits-clock

router(config-bits)# mode revertive

router(config-bits)# end

The following example configures the BITS clock holdover mode:

router(config)# bits-clock

router(config-bits)# mode holdover

router(config-bits)# end

router#

The following example configures the BITS clock freerun mode:

router(config)# bits-clock

router(config-bits)# mode freerun

router(config-bits)# end

Related Commands

Command

Description

bits-clock

Forces the Clock Scheduler Card BITS clock to synchronize to a different external BITS reference signal or switches the clocking mode.

bits-clock disable

Disables BITS clock timing for specific line card slots.

bits-clock primary

Configures a line card interface or a PRP-2 T1/E1 controller to be a primary BITS clock source.

bits-clock secondary

Configures a line card interface or a PRP-2 T1/E1 controller to be a secondary BITS clock source.

clear bits-clock

Resets Clock Scheduler Card BITS clock defaults.

show bits-clock

Displays the status of the current BITS configuration.

show monitor event-trace bits-clock

Displays a log of Clock Scheduler Card BITS clock events.

bits-clock primary

To configure a line card interface or a PRP-2 controller to be a primary BITS clock source, use the bits-clock primary command in bits-clock configuration mode. To delete the configuration, use the no form of this command.

Syntax Description

Species the T1or E1 controllers of the PRP-2 as the BITS clock source.

e1

Specifies the E1 controller.

slot

Specifies the slot number of the E1 controller.

t1

Specifies the T1 controller.

slot

Specifies the slot number of the T1 controller.

interface

Configure line card interface as the BITS clock source

pos

Specifies a Packet-over-SONET interface

slot/port

Specifies the slot number of the Packet-over-SONET Ethernet interface.

Command Default

None

Command Modes

Bits-clock configuration

Command History

Release

Modification

12.0(31)S

This command was introduced for the Cisco 12816 and 12810 routers, the Cisco 12000 PRP-2 and Engine 6 PoS line cards.

Usage Guidelines

The bits-clock primary command configures the BITS clock to synchronize with an external clock signal source. The primary clock source can be either a T1 or E1 controller on the PRP-2, or a BITS-supported line card interface. The primary clock cannot be sourced from the same slot that has been configured for the primary clock source.

Examples

The following example configures the T1 port of a PRP-2 in slot 6 to be a primary BITS clock:

router# conf t

router(config)# bits-clock

router(config-bits)# primary controller T1 6/0

router(config-bits)# end

The following example configures the POS interface of a line card in slot 5 to be a primary BITS clock:

router# conf t

router(config)# bits-clock

router(config-bits)# primary interface pos 5/0

router(config-bits)# end

Related Commands

Command

Description

bits-clock

Forces the Clock Scheduler Card BITS clock to synchronize to a different external BITS reference signal or switches the clocking mode.

bits-clock disable

Disables BITS clock timing for specific line card slots.

bits-clock mode

Configures the Clock Scheduler Card BITS clocking modes.

bits-clock secondary

Configures a line card interface or a PRP-2 T1/E1 controller to be a secondary BITS clock source.

clear bits-clock

Resets Clock Scheduler Card BITS clock defaults.

show bits-clock

Displays the status of the current BITS configuration.

show monitor event-trace bits-clock

Displays a log of Clock Scheduler Card BITS clock events.

bits-clock secondary

To configure a line card interface or a PRP-2 controller to be a secondary BITS clock source, use the bits-clock secondary command in bits-clock configuration mode. To delete the configuration, use the no form of this command.

Syntax Description

Species the T1or E1 controllers of the PRP-2 as the BITS clock source.

e1

Specifies the E1 controller.

slot

Specifies the slot number of the E1 controller.

t1

Specifies the T1 controller.

slot

Specifies the slot number of the T1 controller.

interface

Configure line card interface as the BITS clock source

pos

Specifies a Packet-over-SONET interface

slot/port

Specifies the slot number of the Packet-over-SONET Ethernet interface.

Command Default

None

Command Modes

Bits-clock configuration

Command History

Release

Modification

12.0(31)S

This command was introduced for the Cisco 12816 and 12810 routers, the Cisco 12000 PRP-2 and Engine 6 PoS line cards.

Usage Guidelines

The bits-clock secondary command configures the Clock Scheduler Card (CSC) BITS clock to synchronize with an alternative source for the external BITS clock signal in the event the primary source becomes corrupted or unavailable. The secondary clock source can be either a T1 or E1 controller on the PRP-2, or a BITS-supported line card interface. The secondary clock cannot be sourced from the same slot that has been configured for the primary clock source.

Examples

The following example configures the T1 port of a PRP-2 in slot 6 to be a secondary BITS clock:

router# conf t

router(config)# bits-clock

router(config-bits)# secondary controller T1 6/0

router(config-bits)# end

The following example configures the POS interface of a line card in slot 5 to be a secondary BITS clock:

router# conf t

router(config)# bits-clock

router(config-bits)# secondary interface pos 5/0

router(config-bits)# end

Related Commands

Command

Description

bits-clock

Forces the Clock Scheduler Card BITS clock to synchronize to a different external BITS reference signal or switches the clocking mode.

bits-clock disable

Disables BITS clock timing for specific line card slots.

bits-clock mode

Configures the Clock Scheduler Card BITS clocking modes.

bits-clock primary

Configures a line card interface or a PRP-2 T1/E1 controller to be a primary BITS clock source.

clear bits-clock

Resets Clock Scheduler Card BITS clock defaults.

show bits-clock

Displays the status of the current BITS configuration.

show monitor event-trace bits-clock

Displays a log of Clock Scheduler Card BITS clock events.

show bits-clock

To display the status of the current BITS configuration, use the show bits-clock command in privileged EXEC mode.

show bits-clock [detail]

Syntax Description

detail

Indicates that additional diagnostic information is included in the output.

Command Default

None

Command Modes

Privileged EXEC

Command History

Release

Modification

12.0(31)S

This command was introduced for the Cisco 12816 and 12810 routers, the Cisco 12000 PRP-2 and Engine 6 PoS line cards.

Usage Guidelines

The detail option displays bit-register information used by Cisco engineers for troubleshooting.

Examples

The following example displays the status of the BITS clock configuration:

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